module Rails::Generators::Migration
Holds common methods for migrations. It assumes that migrations has the [0-9]*_name format and can be used by another frameworks (like Sequel) just by implementing the next migration version method.
Attributes
migration_class_name[R]
migration_file_name[R]
migration_number[R]
Public Instance Methods
migration_template(source, destination=nil, config={})
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Creates a migration template at the given destination. The difference to the default template method is that the migration version is appended to the destination file name.
The migration version, migration file name, migration class name are available as instance variables in the template to be rendered.
Examples¶ ↑
migration_template "migration.rb", "db/migrate/add_foo_to_bar.rb"
# File lib/rails/generators/migration.rb, line 45 def migration_template(source, destination=nil, config={}) destination = File.expand_path(destination || source, self.destination_root) migration_dir = File.dirname(destination) @migration_number = self.class.next_migration_number(migration_dir) @migration_file_name = File.basename(destination).sub(/\.rb$/, '') @migration_class_name = @migration_file_name.camelize destination = self.class.migration_exists?(migration_dir, @migration_file_name) if !(destination && options[:skip]) && behavior == :invoke if destination && options.force? remove_file(destination) elsif destination raise Error, "Another migration is already named #{@migration_file_name}: #{destination}" end destination = File.join(migration_dir, "#{@migration_number}_#{@migration_file_name}.rb") end template(source, destination, config) end